bump‧y comparative bumpier, superlative bumpiest
a bumpy surface is flat but has a lot of raised parts so it is difficult to walk or drive on it [= uneven; ≠ smooth]:
a bumpy road
The ground is bumpy in places.
a bumpy journey by car or plane is uncomfortable with movements up and down because of bad road or weather conditions [≠ smooth]:
The plane made a bumpy landing.
having a lot of problems for a long time:
Shareholders have had a bumpy ride.